#include <iostream>
#include <math.h>

int main() {
	using std::cout;
	using std::cin;
	using std::endl;

	long long populationUSA = 0;
	long long populationWorld = 0;

	cout << "Enter the world's population: ";
	cin >> populationWorld;
	cout << "Enter the population of the US: ";
	cin >> populationUSA;

	cout << "The population of the US is "
		<< static_cast<double>(populationUSA) / static_cast<double>(populationWorld) * 100
		<< "% of the world population";

	return 0;
}